* {
  margin: 0;
  padding: 0;
}
html,body {
  width: 100%;
  height: 100%;
}
#root {
  width: 100%;
  height: 100%;
}
.lou-wrap {
  width: 100%;
  height: 100%;
  background: red;
  display: flex;
}
.left {
  width: 100px;
  background: pink;
  overflow-y: auto;
}
.right {
  flex: 1;
  background: skyblue;
  overflow-y: auto;
}
h3 {
  height: 40px;
  width: 100%;
  text-align: center;
  line-height: 40px;
}
h5 {
  background: #ccc;
}
.children-box {
  width: 100%;
  height: 150px;
  background: green;
}
.acttive {
  background: yellow;
}